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Oracle: to increase performance, prefetch 100 rows and enable similar cursor sharing. Both are configurable in database.yml. Closes #6607.

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Consistently use LOWER() for uniqueness validations (rather than mixing with UPPER()) so the database can always use a functional index on the lowercased column. Closes #6495.

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SQLite: count(distinct) queries supported in >= 3.2.6, fix calculations workaround, remove count(distinct) query rewrite, cleanup test connection scripts. Closes #6544.

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Oracle: resolve test failures, use prefetched primary key for inserts, check for null defaults. Factor out some common methods from all adapters. Closes #6515.

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Fix has_many :through to add the appropriate conditions when going through an association using STI. Closes #5783. [Jonathan Viney]  (sorry, forgot to commit the actual files)

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Don't rollback in teardown unless a transaction was started. Don't start a transaction in create_fixtures if a transaction is started. Closes #6282.

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Reverted old select_limited_ids_list postgresql fix that caused issues in mysql.  Closes #5851 [Rick]

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Removes the ability for eager loaded conditions to be interpolated, since there is no model instance to use as a context for interpolation. #5553 [turnip@turnipspatch.com]

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Added timeout option to SQLite3 configurations to deal more gracefully with SQLite3::BusyException, now the connection can instead retry for x seconds to see if the db clears up before throwing that exception (closes #6126) [wreese@gmail.com] Added default timeout setting of 5 seconds to SQLite3 database.yml configurations [DHH]

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Added update_attributes! which uses save! to raise an exception if a validation error prevents saving (closes #6192) [jonathan]

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Association collections have an _ids reader method to match the existing writer for collection_select convenience (e.g. employee.task_ids). The writer method skips blank ids so you can safely do @employee.task_ids = params[:tasks] without checking every time for an empty list or blank values.  References #1887, Closes #5780.

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Deprecation: count class method should be called with an options hash rather than two args for conditions and joins. Closes #6287.

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Deprecation tests. Remove warnings for dynamic finders and for the foo_count ethod if it's also an attribute.

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